Tubular stereotype printing plate



Dec. 18,1923. mwmw H. A. w. WOOD TUBULAR STEREOTYPE PRINTING PLATE Original Filed March 11., 1915 [nven v H .W' W d. ,z gz zzieji 00 Patented Decu l8, 1923.

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HENRY A. WISE WOOD, OF NEW IVLAQHINERY CORPORATION, OF

lh iim lt YORK, I\T. Y., ASSIGNOR 'IO THE WOOD NEWSPAPER NEW YORK, N. A CORPORATION OF VIRGINIA.

TUBULAR STEREOTYPE PRINTING PLATE.

Original application filed March 11, 1915, Serial No. 13,733.

Divided and this application filed December 11, 1919.

To all whom it may concern:

Be it known that I, HENRY A. Wren VVoon, a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented a newand useful Tubular Stereotype Printing Plate, of which the following is a specification.

This is a division of my Patent No. 1,332,531 granted March 2, 1920, on casting and finishing apparatus of curved stereotype printing plates on an application originally filed March 11, 1915, Serial No. 13,- 783, renewed May 16, 1919, Ser. No. 297,565.

This invention relates to the printing plate shown therein. The principal objects of this invention are to provide an improved form of tubular plate, in which the ribs on the inside are so placed as greatly to strengthen the plate and yet to be capable of being shaved out in a simple manner 7 and with the employment of only a little power; to provide a plate with a space cast in it for the reception of a tail cutting saw, and in general to provide a plate suitable for casting, ejecting, and finishing in a mechanism such as that shown in my abovementioned original patent.

Reference is to be had to the accompanying drawings, in which Fig. 1 isa perspective view of a printing plate constructed in accordance with this invention, and

Fig. 2 is a detail sectional view thereof on enlarged scale.

Tubular stereotype plates, as ordinarily constructed, are made in a mold having a cylindrical core and it is necessary to re move them from the casting box by hand, turning the core over into horizontal position for that purpose. They are thenplaced in a boring machine in which the inner surface of the plate is turned smooth in order to fit the plate cylinder of the printing press. This boring operation is slow because the entire inner surface of the plate must be dressed oif by it. It has not been possible to cast these tubular plates with circumferential ribs, or finishing strips, on their inner surfaces because, obviously, they could not be removed from the core in that case without serious and expensive complications. The use of longitudinal ribs is also Serial No. 3%,234.

prevented by the fact that this would make the plates weak between the ribs and furthermore the turning of the interior surfaces of longitudinal ribs would be a more delicate operation than is the case with the circumferential ribs on the ordinary semicylindrical plate.

The machine disclosed in my original patent above mentioned, although capable of general use, is designed especially for making a tubular stereotype printing plate such as shown herein. The plate A is cast with one or more helical ribs a, on its interior surface extending from end to end. I accomplish this in accordance with said original patent by using a core having one or more helical grooves on its exterior througlr out its entire length.

The casting box in which the plate is cast is provided with a matrix bar which extends throughout its length from end to end and results in the provision of a slot 5 through the core throughout its length. This interrupts the rib and divides it into a plurality of ribs but all forming part of a helical sur face. The pouring sheet also is provided with strips throughout its length and adjacent opposite sides of the slot 6. This forms a clearing space 0 at one end of the plate communicating with the slot 5. In other words, this slot is widened at one end by the addition of these spaces. This is for the purpose of receiving the tail-cutting saw when the plate is moved into position for the tail to be cut off at the inner end of the space 0. The tail-cutter cuts into the bottom of this space and as the plate is turned, it cuts the tail oif all the way around substantially even with the bottom of this space 0.

The operation of casting the plate will not be described in detail as it is set forth fully in my original patent above mentioned, but it will be understood that the plate is cast in a cylindrical mold having a cylindrical core concentrically mounted within it and provided with one or more helical grooves. The matrix is inserted with its edges held by the matrix bar which extends the length of the mold. The end of the plate forming the tail is defined by the pouring sheet formed as stated.

The plate is ejected from the mold, pref- Renewed May 16, 1919, Serial No. 297,565.

erably by rotating the core. On account of the screw-thread-grooves inthe core and the corresponding ribs 64 on the inner surface of the plate, this moves the plate out of the mold endwise. The plate is held from rotation by the casting bar in the slot-Z). During this operation the shaving blade, pretterably mounted on the core, shaves ofl the ribs to a true cylindrical surface inside so that they will abut against the cylinder on which it is to be mounted in a true and perfeet manner. Little power is required for the shaving operation'because only a little metal is taken oftat once. Vhen the plate is entirely removed, the tail is cut off in accordance with said patent, the tail cutter registering with the space 0 on the plate from the end of which it encircles the plate to remove the tail or slug.

It will be seenthat the internal ribs a not only extendall the way around the plate,

but also, being angularly disposechextend' continuously from one end to the other, except for the space at b, which divides the rib into a plurality of parallel ribs. These ribs strengthen the plate and form a support for its concave 'side extending throughout its length. The presence of these helical ribs on the plate reduces the amount of handling required to eject the plate and place it in the boring machine. They also reduce the amount of metal necessary to be removed'inorder to bring theplate to a proper cylindrical shape and size. It is to beunderstood also that it isnotneccssa-ry to use a single series ofribs'only, as it is Within the scope of this invention to'use a pluralityor' ribs of series ofthe same character.

Althoughl have illustrated and described only a single form of this inventionfIam aware ofthe fact that modifications can be made therein without departing fromthe ThereforeI do not wishto be limited to 7 all the details of construction herein described, but what IQClO claimtis 2 1. As an'article ot manufactura'a tubular printing plate of stereotype metal having a plurality orincomplete helical ribs on its inner surface. p 1

2. As an article'ofmanufactura a curved printingplateof stereotypemetal having a series of helical projections on its concave surface, each of said projections extending only partwayaround'the article.

3. As anarticle 'o'f manuiacture, a tubular stereotype printing plate constituting almost a complete cylinder and having a "helical rib on its inner surface, and "provided with a narrow gap or space extending longitudinally through the plate dividing the rib into a plurality of "parallel "equally spaced ribs all constitutingpart' of the single helical surfacef v As an article or' manufactnre, a tubular stereotype printing plate having a helical rib'on its inner surface, and-provided'with a slot I extending longitudinally through the plate and dividing said rib'into iaplurality of ribs each having a gap, and having a space on each side of said gap'entending from the end of the plate tothe' bajse of lthe tail thereoffor the reception ofa'tail-Jc lt, ting tool. 1

5. As an article ofmanufacture, a tu bular stereotype printing plate having a sigh extending longitudinally frcm' end "to enfdj through theiplate, said slot beingfenlarged at one end for the reception'of -atail clitting r001. In testimony whereof I havahereunto 'aihxed my signature.

HENRY W09 fee 

